# A027280 (b-file synthesized from sequence entry) 3 26 4 164 5 1224 6 7664 7 51488 8 326456 9 2126376 10 13574046 11 87554326 12 560845908 13 3607790136 14 23158545126 15 148945375022 16 957564479960 17 6162874994108 18 39672627184498 19 255578754020002 20 1647166273816172 21 10622076015026288 22 68529892093271816 23 442357250742603624